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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

Here is the picture:
- every time i'm trying to unmount my /dev/hda5 (vfat partition) it says that the device is busy.
- I have commented out its entry in /etc/fstab
- after that I restarted my PC so /dev/hda5 would not be mounted
- then mounted it manually using this line: mount -t vfat /dev/hda5 /windows/fat
- it mounted perfectly fine, but I can't unmounted. It says device is busy, just like when it's mounted using fstab.

I also made sure that when I do unmount I am not in /windows/fat, there for this partition is not being used at the moment of umount.

I had a very similar prblem with CD/DVD discs on Fedora Core 3. Every time I tried to unmount and then open the tray, I got an error saying it was busy. I eventually figured out that if I just used the eject command instead - it worked. I never really did figure out what was wrong, hoever I would be willing to bet while clearly not the same trouble, probably related. Also I'm working mounting a bunnch of different drives in Fedora Core 4 right now (on my Dell Laptop, my NTFS partition and an NTFS USB Drive) and was able to follow / modify this gentleman's instructions for my needs: http://www.mjmwired.net/resources/mjm-fedora-fc4.html
I have found his guide pretty invaluable in assiting me with minor annoyances on my machine.

Any way, I decided that maybe I should delete .Trash-vitali and then I ran lsof /dev/hda5 again.
After that I got this out put.
gam_serve 2825 vitali 15r DIR 3,5 4096 902 /windows/fat/.Trash-vitali (deleted)

I still was not able to unmount.
So i decided to kill gam_serve. Every time I kill it, it would just get new PID. By the way its PPID is 1 so I assume it belongs to init.

I just mounted vfat parttion again the same way I was doing it and then I was able to unmount it with no problem with out killing "gam_serve". Now i 'm just confused.
I took a look at this links you guys posted and they give a good insight on the problem.

So I think I'll update my "gam_serve" if this problem appears again, since killing it was not solving the problem before.